For experienced users, perhaps?
Replace the sliding dot with a larger one that shows a letter for the slider's assigned function. Eg: 'P' for pitch, 'T' for tempo, etc. Perhaps a long press on this button could optionally pop up numerical controls? If you can reduce height of slider bars, you could also see/use more of them without needing to scroll.
A-B fine tune? Long press on A or B slide button would activate a 'live' track playback where the full range of the slide would help user scan, listen, and find the exact spot (within, say, a 3 sec +/- spot of initial engagement) as they mice back and forth. Ideal? An auto corresponding zoom in the waveform display.